Start with Camunda 7 tomcat / Instances duplicated in user task

Hi,

I can’t figure out what is wrong with the configuration…
After running the process it runs fine except this: if several instances of the execution of the process accumulate in one place (Fig. 1), after completing the task for ONE instance, the following user task is created for ALL instances (although only 1 token comes out of the task and only one letter is sent for the completed task (I send letters to myself so far, I receive only one letter )) but the uncompleted tasks remain the same, in other words, they are duplicated - Figure 2.

Fig. 1:


Fig. 2:

The configuration for all user tasks looks like this:

What am I doing wrong?
Why are process instances duplicated?